Hi @Zhou, Jack ,
I understand that you are having issues with the Teams add-in in Outlook. It seems that the location of the add-in is empty, which means that the add-in is not properly registered in the registry.
To fix this problem, you can try to re-register the add-in manually by running a command in the Command Prompt. You need to use the appropriate command depending on your Office installation (64-bit or 32-bit).
64 Bit Office: %SystemRoot%\System32\regsvr32.exe /n /i:user %LocalAppData%\Microsoft\TeamsMeetingAddin\1.0.18012.2\x64\Microsoft.Teams.AddinLoader.dll
32 Bit Office: %SystemRoot%\SysWOW64\regsvr32.exe /n /i:user %LocalAppData%\Microsoft\TeamsMeetingAddin\1.0.18012.2\x86\Microsoft.Teams.AddinLoader.dll
Alternatively, you can also use the Microsoft Support and Recovery Assistant, which is a tool that can automatically detect and fix common issues with Office apps.
Here is additional document for your reference: Resolve issues with Teams Meeting add-in for Outlook
I hope this helps you resolve your issue with the Teams add-in in Outlook.
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